May says EU response to UK Brexit plan 'unacceptable'

British Prime Minister Theresa May said Friday the European Union's abrupt dismissal this week of her Brexit plan was unacceptable, as she conceded negotiations were "at an impasse". European leaders refused to give ground to May at a summit in Salzburg on Thursday, warning that her proposals for future economic ties based on a UK-EU free-trade area only for goods would "not work".